In order to understand the response of paleovegetation to climate changes,we analyzed the lignin composition in a sediment Core T08collected from Fujian and Zhejiang Coastal Mud Zone.Together with the analysis of TOC and delta~(13)C parameters,we discussed the variability of the sources and degradation of sedimentary terrigenous organic matter.The lignin content of upper core was higher than the lower half,indicating increased input of modern terrigenous vegetation.The changing trend of syringyl/vanillyl (S/V),cinnamyl/vanillyl(C/V)and the lignin phenol vegetation index(LPVI)was basically the same, indicating that lignin of the sediment core mainly came from the woody and non-woody tissues of angiosperms and non-woody tissues of gymnosperms also had some contribution.To some extent,the change of vegetation parameters reflects the response of terrestrial vegetation to climate change,but still exist time lag phenomenon.The ratios of the total acid phenols to the total aldehyde phenols of syringyl or vanillyl units((Ad/Al)s and(Ad/Al)v)and P/(V+S)(P:p-hydroxyl phenols)indicated that lignin in the sediment core underwent moderate oxidative and demethylation/demethoxy degradation,and the degree of degradation did not increase with increasing depth.There is no time lag phenomenon in response of degradation parameters to climate change.